Transmission electron microscopy study of ion-beaminduced amorphization of Ca2La8(SiO4)6O2

Wang, L. M.; Weber, William J.

doi:10.1080/01418619908214286

Cited by 45 publications

(10 citation statements)

References 29 publications

(6 reference statements)

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“…The relative disorder increases steadily with irradiation due to the accumulation of defect clusters and saturates after a crystal to amorphous transition. The threshold dose for complete amorphization of HA at room temperature under 4 MeV Kr 17+ ion irradiation obtained in the present study was around 0.5 dpa, which is consistent with earlier research on apatite and other ceramic materials [53]. It should be noted that HRTEM observation has its limits considering the very localized and thin regions of sample, nevertheless, diffraction results confirm the observed amorphous transition seen in these images.…”

Section: Discussionsupporting

confidence: 92%

Enhancement of hydroxyapatite dissolution through structure modification by Krypton ion irradiation

Zhu

Guo

Zang

et al. 2020

Journal of Materials Science & Technology

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Hydroxyapatite (HA) synthesized by a wet chemical route was subjected to heavy ion irradiation, using 4 MeV Krypton ions (Kr 17+ ) with ion fluence ranging from 1×10 13 to 1×10 15 ions/cm 2 . Glancing incidence X-ray diffraction (GIXRD) results confirmed the phase purity of irradiated HA with a moderate contraction in lattice parameters, and further indicated irradiation-induced structural disorder, evident by a broadening of diffraction peaks. High-resolution transmission electron microscopy (HRTEM) observations indicated that the applied Kr irradiation induced significant damage in the hydroxyapatite lattice. Specifically, cavities were observed with their diameter and density varying with irradiation fluences while a radiationinduced crystalline-to-amorphous transition with increasing ion dose was identified. Raman and X-ray photoelectron spectroscopy (XPS) analysis further indicated the presence of irradiation-induced defects.Compositional analysis of pristine and irradiated materials following immersion in Tris (pH 7.4, 37℃) buffer showed that dissolution in vitro was enhanced by irradiation, reaching a peak for 0.1dpa. We examined the effects of irradiation on the early stages of the mouse osteoblast-like cells (MC3T3-E) response. A cell counting kit-8 assay (CCK-8 test) was carried out to investigate the cytotoxicity of samples, and viable cells can be observed on the irradiated materials.

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Section: Discussionsupporting

confidence: 92%

Enhancement of hydroxyapatite dissolution through structure modification by Krypton ion irradiation

Zhu

Guo

Zang

et al. 2020

Journal of Materials Science & Technology

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“…All the work performed on actinide-rich natural phases can explain why apatite ceramics have been synthesized in laboratories and studied as potential waste forms for high-level nuclear waste, particularly for actinide-rich waste streams [30,31,32,33]. For instance, the effects (amorphization, swelling) of both internal radiation by 244 Cmdoping [14,34,35,36,37,38,39,40] and external irradiation with heavy ions [14,33,41,42,43,44] (with energies around a few MeV) or -particles [42,45] have been studied for purely silicate apatites such as Ca2RE8(SiO4)6O2. Their crystalline structure exhibits hexagonal symmetry (space group P63/m) and consists of isolated SiO4 tetrahedra also referred to as Q 0 units (there is no bridging oxygen atom (BO) connecting two tetrahedra) with the Ca 2+ and RE 3+ cations located in two sites in which actinides may also enter [46,47,48] : a 7-fold coordinated site (6h site) that is preferentially occupied by RE 3+ cations surrounded by six oxygen atoms linked to SiO4 tetrahedra and one isolated oxygen anion and a 9-fold coordinated site (4f site) surrounded by nine oxygen atoms linked to SiO4 tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

External irradiation with heavy ions of neodymium silicate apatite ceramics and glass-ceramics

Chouard

Caurant

Majérus

et al. 2019

Journal of Nuclear Materials

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This work aims at comparing the damage induced in the Nd silicate apatite ceramic (Ca2Nd8(SiO4)6O2) by medium energy (ME) and swift heavy ion (SHI) irradiations to evaluate the effects of nuclear collisions and intense electronic excitations for ME ions and SHI ions respectively. The macroscopic induced changes were studied as a function of the fluence by swelling and hardness measurements, whereas structural modifications were followed by X-ray diffraction, Raman spectroscopy and grazing incidence EXAFS (Nd L3-edge). At ME (1.9-6.75 MeV Au ions), radiation-induced amorphization occurred above 6.22x10 13 Au/cm 2 associated with a volume expansion of about 8% and a drop of 37% in hardness. At SHI (90 MeV Xe ions or 35 MeV Ar ions), similar macroscopic and structural changes were observed. The electronic stopping power threshold of Nd silicate apatite for amorphization was assessed at about Se = 5 keV/nm. As apatite crystals containing actinides could be present in rare-earths rich nuclear glasses, SHI irradiation with Xe (995 MeV) ions was also used to damage the Nd silicate apatite crystals dispersed in a soda-lime aluminoborosilicate simplified nuclear glass over a depth of about 60 µm, to evaluate the possible formation of cracks in the residual glass due to crystals swelling. In spite of apatite crystals amorphization under SHI irradiation in the glass-ceramics, no cracking was observed in the glassy phase even close to the biggest crystals which could be explained by strain relaxation in the glass due to plastic deformation (creep) induced by SHI ion beam.

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“…Based on high-resolution transmission electron microscopy (HRTEM), irradiationinduced amorphization of SiC appears to occur somewhat homogeneously on the atomic-level or nanoscale. While some experimental methods, such as HRTEM coupled with advanced image processing, 9,10 can provide details on the length scale of individual cascades (<100 nm) or subcascades (<10 nm), methods are not currently available that can provide information on the time (<10 ps) scale of individual cascade events. While some experimental methods, such as HRTEM coupled with advanced image processing, 9,10 can provide details on the length scale of individual cascades (<100 nm) or subcascades (<10 nm), methods are not currently available that can provide information on the time (<10 ps) scale of individual cascade events.…”

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confidence: 99%

Atomic-scale simulations of multiple ion–solid interactions and structural evolution in silicon carbide

Gao

Weber

2002

J. Mater. Res.

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Molecular dynamics (MD) were employed in atomic-level simulations of fundamental damage production processes due to multiple ion-solid collision events in cubic SiC. Isolated collision cascades produce single interstitials, vacancies, antisite defects, and small defect clusters. As the number of cascades (or equivalent dose) increases, the concentration of defects increases, and the collision cascades begin to overlap. The coalescence of defects and clusters with increasing dose is an important mechanism leading to amorphization in SiC and is consistent with the homogeneous amorphization process observed experimentally in SiC. The driving force for the crystallineamorphous (c-a) transition is the accumulation of both interstitials and antisite defects. High-resolution transmission electron microscopy (HRTEM) images of the defect accumulation process and loss of long-range order in the MD simulation cell are consistent with experimental HRTEM images and disorder measurements. Thus, the MD simulations provide atomic-level insights into the interpretation of experimentally observed features associated with multiple ion-solid collision events in SiC.

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Transmission electron microscopy study of ion-beaminduced amorphization of Ca₂La₈(SiO₄)₆O₂

Cited by 45 publications

References 29 publications

Enhancement of hydroxyapatite dissolution through structure modification by Krypton ion irradiation

Enhancement of hydroxyapatite dissolution through structure modification by Krypton ion irradiation

External irradiation with heavy ions of neodymium silicate apatite ceramics and glass-ceramics

Atomic-scale simulations of multiple ion–solid interactions and structural evolution in silicon carbide

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